EP2492026A1 - Procédé de décapage par fluide haute pression et à chaud et appareil de décapage - Google Patents

Procédé de décapage par fluide haute pression et à chaud et appareil de décapage Download PDF

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Publication number
EP2492026A1
EP2492026A1 EP12156389A EP12156389A EP2492026A1 EP 2492026 A1 EP2492026 A1 EP 2492026A1 EP 12156389 A EP12156389 A EP 12156389A EP 12156389 A EP12156389 A EP 12156389A EP 2492026 A1 EP2492026 A1 EP 2492026A1
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EP
European Patent Office
Prior art keywords
nozzles
rolling stock
descaling
adjacent
main pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12156389A
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German (de)
English (en)
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EP2492026B1 (fr
Inventor
Kun-Cheng Tung
Chung-Ping Ju
Pi-Kun Cheng
Chao-Chi Huang
Chun-Chao Shih
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China Steel Corp
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China Steel Corp
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Publication date
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Application filed by China Steel Corp filed Critical China Steel Corp
Publication of EP2492026A1 publication Critical patent/EP2492026A1/fr
Application granted granted Critical
Publication of EP2492026B1 publication Critical patent/EP2492026B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically

Definitions

  • the present invention relates to a descaling method and a descaling apparatus, more particular to a descaling method and a descaling apparatus that apply high-pressure fluid to remove the scale on the surface of semifinished products (referred as rolling stock) in the hot rolling processes, such as the rolling of steel strip, steel plate, shaped steel, steel bar, wire rod, etc., for descaling purpose.
  • rolling stock semifinished products
  • the scale on the surface of the rolling stock must be removed preceding rolling to prevent from the rolled-in-scale defects in a conventional hot rolling process such as for steel strip or steel plate. Therefore, a high-pressure fluid descaling apparatus is usually arranged before the rolling machine.
  • FIG. 1(a) shows the schematic drawing of the impact regions formed by the ejection of the nozzles of the conventional high-pressure fluid descaling apparatus
  • FIG. 1(b) shows the schematic drawing of the arrangement of the descaling apparatus
  • FIG. 1(c) shows the side view of a conventional high-pressure fluid descaling apparatus.
  • B is the jet width
  • E is the nozzle distance
  • O is the overlapping
  • ⁇ is the offset angle of the nozzle axis against the header axis.
  • ⁇ is the nozzle spray angle
  • ⁇ in FIG. 1(c) is the inclination (lead) angle.
  • the inclination angles ⁇ is to lead the scale up-stream so as to prevent from rolled-in-defects in rolling stock such as the steel strip or the steel plate.
  • general conventional descaling flushes the scales away against the rolling stock transportation direction, and the inclination angle ⁇ is generally about 15°.
  • FIG. 2 shows the A-A cross-section of FIG. 1(b) about the overlapping of the jet spray of the conventional adjacent nozzles
  • FIG. 3 shows the rebounding of the jet spray of the conventional nozzles, in which X is the diverging angle due to the rebounding
  • FIG. 4 shows the usage of an aluminium plate in the erosion experiment of two adjacent impact regions, in which G is the width of the blank region and W is the width of the softened region after being eroded.
  • the jet curtains 12, 13 out of nozzles 11 are diverged by the offset angle ⁇ to prevent them from interfering with each other, thereby decreasing the uniformity of descaling.
  • the impact regions 14, 15 on the surface of the rolling stock 10, which are formed by the jet curtains 12, 13 ejected by the consecutive nozzles 11, are partly overlapped so as to remove the scale evenly.
  • the testing results are not to the anticipation. It turns out as shown in FIG. 4 that the impact regions 14, 15 of the adjacent nozzles 11 do not overlap and there is a blank region (G) created, in which there is no erosion effect.
  • the blank region (G) occurs mainly because the rebounding fluid 16 from the jet curtain 13 behind the overlapped region interferes with the jet curtain 12 ahead of the overlapped region as shown in FIG. 2 .
  • Part of the jet curtain 12 may not effectively reach the overlapped region on the aluminium test plate; hence, the impact force is greatly reduced.
  • Another important reason is that the rebounding fluid tends to extend towards two sides where there is less pressure. As a result, the rebounding fluid 16 will diverge outwardly as shown in FIG. 3 .
  • the present invention is directed to a high-pressure fluid descaling method and apparatus applied in hot rolling process, wherein the apparatus comprises at least one descaling unit, the at least one descaling unit comprising a main pipe header and a plurality of nozzles, wherein a projection of an axial direction of the main pipe header on a surface of the rolling stock and a rolling stock transportation direction intersects, and the main pipe header is used to supply a jet fluid.
  • the nozzles are arranged on the main pipe header. Each nozzle is orientated towards a direction opposite to the rolling stock transportation direction so as to erode the scale off the surface of the rolling stock.
  • the jet fluid ejected from the nozzles forms a plurality of impact regions on the surface of the rolling stock, of which the regions are alternately parallel to each other.
  • the center lines of the impact regions along the longitudinal direction of the regions are evenly spaced apart and perpendicular to the rolling stock transportation direction.
  • the high-pressure fluid descaling method and descaling apparatus applied in hot rolling process according to the present invention can reduce the interference caused by the rebounding fluid from the jet curtains of the adjacent nozzles, thereby improving the descaling quality and reducing the scale on the surface of the rolling stock, which in turn improves the quality of the surface of the products.
  • the invention can be applied to the hot rolling process such as to the steel strip, steel plate, shaped steel, steel bar and wire rod.
  • FIG. 5(a) shows a schematic drawing simulating the impact regions formed on the surface of the rolling stock by the jet curtains of the nozzles of the hot rolling high-pressure fluid descaling apparatus, according to a first embodiment of the present invention
  • FIG. 5(b) shows a schematic drawing of the arrangement of the descaling nozzles of the hot rolling high-pressure fluid descaling apparatus, according to the first embodiment of the present invention
  • FIG. 5(c) shows the side view of the hot rolling high-pressure fluid descaling apparatus, according to the first embodiment of the present invention.
  • the hot rolling high-pressure fluid descaling apparatus 2 comprises at least one descaling unit 20, wherein the descaling unit comprises a main pipe header 21 and a plurality of nozzles 22.
  • the descaling unit comprises a main pipe header 21 and a plurality of nozzles 22.
  • the axial direction of the main pipe header 21 is perpendicular to the rolling stock transportation direction.
  • the rolling stock 3 can be strip, plate, billet, rod, bar, shaped beam, etc.
  • the nozzles 22 are arranged on the main pipe header 21. Each nozzle 22 is orientated towards a direction opposite to the rolling stock transportation direction; i.e., the direction of descaling jet by high-pressure fluid is opposite to the rolling stock transportation direction.
  • the nozzles 22 comprise a plurality of first nozzles 221 and a plurality of second nozzles 222 adjacent to the first nozzles 221.
  • the first nozzles 221 and the second nozzles 222 eject the fluid onto the surface of the rolling stock 3 so as to form a plurality of first impact regions 31 and a plurality of second impact regions 32 adjacent to the first impact regions 31, in which the two regions are alternately parallel to each other.
  • the first impact regions 31 and the second impact regions 32 are overlapped in the rolling direction on the surface of the rolling stock 3.
  • the center lines of the regions along the longitudinal direction of the regions are evenly spaced apart with a distance D and are perpendicular to the rolling stock transportation direction.
  • the first nozzles 221 and the adjacent second nozzles 222 are spaced apart along the axial direction of the main pipe header 21 and arranged alternately; that is, the first nozzle 221 ejects jet curtain 23 and the adjacent second nozzle 222 ejects jet curtain 24, which form the impact region 31.
  • the impact region 32 will be produced in the next impact area arranged by the consecutive nozzles.
  • the nozzle and its adjacent nozzle will be arranged alternately. Hence, the impact regions occur respectively. (see FIGs. 5(a) and 5(b) ).
  • the positions of the first nozzles 221 and the second nozzles 222 may be arranged in a way that the center lines 223 of the first nozzles 221 and the center lines 224 of the adjacent second nozzles 222 are parallel to one another and symmetric to the radial line 212 passing through an axis of the main pipe header 21 (as shown in FIG. 5(c) ).
  • the center lines 223 of the first nozzles 221 and the center lines 224 of the adjacent second nozzles 222 are parallel to one another and symmetric to the radial line 212, which does not pass through the axis of the main pipe header 21 (as shown in FIG. 6 , where the center lines 224 of the second nozzles 222 and the axis 211 of the main pipe header 21 intersect.)
  • D is the distance between the first impact regions 31 and the second impact regions 32; whereas, D' is the distance between the first nozzles 221 and the second nozzles 222, and ⁇ is the inclination angle that is between the center line of the first nozzles 221/ the second nozzles 222 and the normal line of the surface of the rolling stock.
  • D' D cos ⁇ .
  • the positions of the first nozzles 221 and the second nozzles 222 may be arranged in a way that their corresponding center lines would not be parallel to one another.
  • their center lines 223 and 224 may or may not intersect the axis 211 of the main pipe header 21 along the longitudinal direction (as shown in FIGs. 7 and 8 ).
  • D is the distance between the first impact regions 31 and the second impact regions 32; whereas, H is the distance from the surface of the rolling stock to the intersection of center lines 223 and 224.
  • ⁇ 1 is the first inclination angle between the center line 223 of the first nozzle 221 and the normal line of the surface of the rolling stock; whereas, ⁇ 2 is the second inclination angle between the center line 224 of the second nozzle 222 and the normal line of the surface of the rolling stock.
  • D H(sin ⁇ 1-sin ⁇ 2).
  • the hot rolling high-pressure fluid descaling apparatus 2 may further comprise an extended portion 5, which is regarded as a pillar (such as a square pillar or a cylinder).
  • the extended portion 5 may either in the form of only one piece connect all the nozzles 22 to the main pipe header 21, or at least one piece connect one or more than one nozzle 22 to the main pipe header 21.
  • the center lines 223 of the first nozzles 221 and the center lines 224 of the adjacent second nozzles 222 may or may not be parallel to one another (as shown in FIGs. 9 and 10 ).
  • the extended portion 5 added to each single nozzle is more suitable for the larger distance between nozzles 22; whereas, the extended portion 5 added as a lump unit to more than one nozzle 22 is more suitable for the smaller distance between nozzles 22.
  • FIG. 11 shows a schematic drawing of a hot rolling high-pressure fluid descaling apparatus based on the second embodiment of the present invention.
  • the descaling apparatus 6 comprises two rows of descaling unit 20 as mentioned in FIG. 5(c) , wherein the center lines of the nozzles 22 in the front descaling unit 20 are preferably arranged one half of the nozzle distance E offset to the corresponding nozzles in the rear descaling unit.
  • the components, which are the same as those of the hot rolling high-pressure fluid descaling apparatus 2 in the first embodiment are designated by the same reference numbers and will not be described again. It is understood that the two descaling units 20 are identical to each other and may be regarded as either one of the drawings shown in FIGs. 6 to 10 .
  • FIG. 12 shows a schematic drawing simulating the erosion marks formed on the surface of the rolling stock by the jet spray based on the experiment with conventional high-pressure fluid descaling apparatus, which uses an aluminium plate as a testing plate.
  • FIGs. 13 to 14 show schematic drawings simulating the erosion marks formed on the surface of an aluminium plate by the jet spray of the adjacent nozzles, according to the present invention.
  • the arrangement of the nozzles 22 of the descaling apparatus 2 including the first nozzles 221 and the adjacent second nozzles 222, creates impact regions 31 and 32 from the corresponding first nozzles 221 and second nozzles 222, according to the present invention.
  • the impact regions 31 and 32 emerge on the rolling stock 3 alternately, wherein impact regions 31 and 32 are parallel to one another, that is, the offset angle ⁇ approaches zero.
  • the offset angle ⁇ of the nozzles is 15° in conventional design.
  • the hot rolling high-pressure fluid descaling apparatus according to the present invention, can effectively reduce the width of the blank region under the same distance D between the impact regions, and thus improves the descaling quality.
  • the width of the blank region G depends on the diverging angle X of the rebounding fluid and the distance D between the impact regions 31 and 32.
  • the width of the blank region G is to the minimum theoretically. Yet, due to the errors accumulated from the manufacturing, assembling and the installing of the whole descaling unit 20, the distance D between the impact regions may become smaller than t. The jet spray 23 and the jet spray 24 may also interfere with each other, thereby increase the width of the blank region G. As described previously in the present invention, the relationship between the parameters t, D and E is preferred to be regulated as following: t ⁇ D ⁇ E sin ⁇ 15 ⁇ ° .
  • Table 1 is a comparison of erosion experiments by the descaling apparatus between the present invention and the conventional one.
  • the present invention is also a method applicable to hot rolling high-pressure fluid descaling practices.
  • the hot rolling high-pressure fluid descaling apparatus 2 is used to conduct hot rolling descaling as shown in FIG. 5(b), FIG. 5(c) , FIG. 11 and FIG. 13 .
  • a fluid in the main pipe header 21 of the descaling unit 20, which can be more than one set, via the nozzles 22 including the first nozzles 221 and the adjacent second nozzles is used to form a plurality of corresponding first jet sprays 23 and the adjacent second jet sprays 24, which are orientated towards the direction opposite to the rolling stock transportation direction and ejected to the surface of the rolling stock 3so as to clean off the scale.
  • the first jet sprays 23 and the second jet sprays 24 form corresponding impact regions 31 and 32 on the surface of the rolling stock 3.
  • the first impact regions 31 and the adjacent second impact regions 32 are essentially parallel to one and another and distributed alternately on the surface of the rolling stock 3.
  • the impact regions 31 and 32 overlap along the rolling stock transportation direction, of which the center lines of the impact regions along the longitudinal direction are spaced apart with a impact distance D.
  • the longitudinal direction of the impact regions is essentially perpendicular to the rolling stock transportation direction.
  • the fluid is ejected onto the surface of the rolling stock 3 through the nozzles 22 with a inclination (lead) angle between 5° and 45°.
  • the hot rolling high-pressure fluid descaling method may also apply the hot rolling high-pressure fluid descaling apparatus 6 with two rows of descaling units 20 to conduct descaling for the rolling stock 3 as shown in FIG. 11 .
  • the fluid in the main pipe headers 21 of two descaling units 20 is ejected to the surface of the rolling stock 3 through the nozzles 22 of the the descaling units 20, wherein the center lines of the nozzles 22 of the two descaling units 20 are arranged alternately and spaced apart with one half of the nozzle distance E.
  • the descaling impact force can be enhanced by reducing the spray angle; alternatively, the distance between nozzles can be increased to reduce the number of the nozzles being arranged, hence save the consumption of descaling fluid and improve the descaling efficiency.
  • the hot rolling high-pressure fluid descaling apparatus may have one descaling unit or two descaling units, which may be applied for the removing of scale before the rolling machine, the mill descaling PSB (Primary Scale Breaker) or FSB (Finishing Scale Breaker) so as to enhance the descaling.
  • the hot rolling high-pressure fluid descaling apparatus forms the impact regions on the surface of the rolling stock, which are parallel to one another. The interference caused by the rebounding fluid from the jet sprays of the adjacent nozzles is reduced to the minimum, so as to reduce the width of the blank region.
  • the center lines of the nozzles in the front descaling unit are preferably arranged one half of the nozzle distance E offset to the corresponding nozzles in the rear descaling unit, which solves the problem of the blank regions produced via the interference of the jet sprays from the adjacent nozzles.
  • the hot rolling high-pressure fluid descaling method and descaling apparatus can improve the descaling quality, reduce the roll-in-scale in the surface of the products and therefore improve the surface quality of the products.
  • the hot rolling high-pressure fluid descaling method and descaling apparatus can be applied to the hot rolling processes such as for steel strip, steel plate, shaped steel, steel bar and wire rod.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Nozzles (AREA)
EP12156389.4A 2011-02-25 2012-02-21 Procédé de décapage par fluide haute pression et à chaud et appareil de décapage Not-in-force EP2492026B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW100106326A TWI511809B (zh) 2011-02-25 2011-02-25 Method and apparatus for deruring hot - rolled high - pressure fluid

Publications (2)

Publication Number Publication Date
EP2492026A1 true EP2492026A1 (fr) 2012-08-29
EP2492026B1 EP2492026B1 (fr) 2015-04-08

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US (1) US9174256B2 (fr)
EP (1) EP2492026B1 (fr)
JP (1) JP5681130B2 (fr)
KR (1) KR101418636B1 (fr)
TW (1) TWI511809B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103658204B (zh) * 2012-09-25 2016-06-22 宝山钢铁股份有限公司 一种射流清洗喷嘴的布置方法
KR101820748B1 (ko) * 2014-12-24 2018-01-23 주식회사 포스코 압연소재의 디스케일러
JP6310443B2 (ja) * 2014-12-24 2018-04-11 ポスコＰｏｓｃｏ 圧延素材のデスケーラ
DE102016217561A1 (de) * 2016-03-18 2017-09-21 Sms Group Gmbh Vorrichtung und Verfahren zum Entzundern eines bewegten Werkstücks

Citations (4)

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Publication number Priority date Publication date Assignee Title
US3510065A (en) * 1968-01-05 1970-05-05 Steinen Mfg Co Wm Descaling nozzle
JPS5732820A (en) * 1980-08-08 1982-02-22 Kawasaki Steel Corp Scale removing method for hot rolled steel plate
US5884643A (en) * 1994-07-18 1999-03-23 Kawasaki Steel Corporation Cleaning method and cleaning apparatus for surface of sheet steel
EP1900449A1 (fr) * 2006-09-16 2008-03-19 SMS Demag AG Poutre de pulvérisation d'une installation de décalaminage hydraulique et procédé de fonctionnement d'une telle poutre de pulvérisation

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JPH01317615A (ja) 1988-03-30 1989-12-22 Sumitomo Metal Ind Ltd スプレ・ヘッダ
JP2565570B2 (ja) 1989-08-14 1996-12-18 株式会社 興研 三相水抵抗器における地絡電流抑制法および装置
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JPH09308909A (ja) 1996-05-17 1997-12-02 Nippon Steel Corp スケールの除去方法
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JP3307874B2 (ja) * 1998-03-23 2002-07-24 川崎製鉄株式会社 デスケーリング装置
KR100782692B1 (ko) 2001-10-09 2007-12-07 주식회사 포스코 고압수 분사폭의 설정을 통하여 스케일 제거효율을극대화시킨 박판 스케일 제거장치
JP4238260B2 (ja) 2006-09-19 2009-03-18 新日本製鐵株式会社 鋼板の冷却方法
JP4800245B2 (ja) * 2007-03-15 2011-10-26 新日本製鐵株式会社 鋼片のスケール除去装置
JP5672664B2 (ja) * 2009-05-18 2015-02-18 Ｊｆｅスチール株式会社 鋼板のデスケーリング方法およびその装置
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Publication number Priority date Publication date Assignee Title
US3510065A (en) * 1968-01-05 1970-05-05 Steinen Mfg Co Wm Descaling nozzle
JPS5732820A (en) * 1980-08-08 1982-02-22 Kawasaki Steel Corp Scale removing method for hot rolled steel plate
US5884643A (en) * 1994-07-18 1999-03-23 Kawasaki Steel Corporation Cleaning method and cleaning apparatus for surface of sheet steel
EP1900449A1 (fr) * 2006-09-16 2008-03-19 SMS Demag AG Poutre de pulvérisation d'une installation de décalaminage hydraulique et procédé de fonctionnement d'une telle poutre de pulvérisation

Also Published As

Publication number Publication date
US9174256B2 (en) 2015-11-03
JP2012176439A (ja) 2012-09-13
TW201235126A (en) 2012-09-01
TWI511809B (zh) 2015-12-11
KR101418636B1 (ko) 2014-07-14
EP2492026B1 (fr) 2015-04-08
JP5681130B2 (ja) 2015-03-04
KR20120098492A (ko) 2012-09-05
US20120216839A1 (en) 2012-08-30

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